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Anti Theft Sys - 2003

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Old 11-14-2008, 03:09 PM
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Default Anti Theft Sys - 2003

I have an '03 F-150 Crew Cab. It will not start and the anti-theft light keeps blinking so I think it's engaged. I can unhook the battery for about 30 minutes and it will start. But after a period of time it will happen again. Is there a way to reset the anti-theft device with out going into the dealership? Is there any thing else I should check?
Old 11-14-2008, 09:57 PM
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Is the light flashing very fast or the normal random blip?
With a PATS [passive anti theft system] problems you almost always have to go to a dealer.
Here's something simple to try is switching keys to see if the problem keeps happening the same way. If in any way the key has a problem this will set the PATS too.
Old 11-19-2008, 11:01 AM
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The truck started all day yesterday with no problem.
We also discovered when it rains we get some water on the drivers side floor board. I followed the water up the back wall into the dash.
Maybe something got wet under there and caused some malfuncation....
Old 11-19-2008, 10:03 PM
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Your GEM is failing because its getting wet, very common F150 problem. Its located behind the fuse box under the dash.
Old 11-22-2008, 02:47 PM
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Thanks for the info. What is a GEM and what does it look like? If I can stop the leak do you think this problem will be fixed?
Old 11-23-2008, 09:25 AM
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This diagram should help:




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